Reset code age when serializing code objects.

src/objects.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 5292 matching lines @@
     kPreAgedCodeAge = kIsOldCodeAge - 1
   };
 #undef DECLARE_CODE_AGE_ENUM
 
   // Code aging.  Indicates how many full GCs this code has survived without
   // being entered through the prologue.  Used to determine when it is
   // relatively safe to flush this code object and replace it with the lazy
   // compilation stub.
   static void MakeCodeAgeSequenceYoung(byte* sequence, Isolate* isolate);
   static void MarkCodeAsExecuted(byte* sequence, Isolate* isolate);
+  void MakeYoung();
   void MakeOlder(MarkingParity);
   static bool IsYoungSequence(Isolate* isolate, byte* sequence);
   bool IsOld();
   Age GetAge();
   // Gets the raw code age, including psuedo code-age values such as
   // kNotExecutedCodeAge and kExecutedOnceCodeAge.
   Age GetRawAge();
   static inline Code* GetPreAgedCodeAgeStub(Isolate* isolate) {
     return GetCodeAgeStub(isolate, kNotExecutedCodeAge, NO_MARKING_PARITY);
   }
@@ skipping 5527 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_